[Dovecot] Exim Dovecot Authentication Problem

[Marc Perkel]

ok - making some progress but still not working. Here's the error I'm 
getting.

2008-01-20 08:06:37 dovecot_plain authenticator failed for 
bigdog1.junkemailfilter.com ([192.168.2.112]) [209.204.160.104]: 435 
Unable to authenticate at present: authentication socket protocol error

Exim side:

dovecot_plain:
  driver = dovecot
  public_name = PLAIN
  server_socket = /var/run/dovecot/auth-client
  server_set_id = $auth1

Dovecot Side:

auth default {

  mechanisms = plain

  passdb passwd-file {
    # Master users that can log in as anyone
    args = /etc/dovecot.masterusers
    master = yes
    pass =yes
  }


  # Linuxconf passwd-like file with specified location
  passdb passwd-file {
    args = /etc/exim/control/vmail/shadow.%d
  }


  # Linuxconf passwd-like file with specified location
  userdb passwd-file {
    args = /etc/exim/control/vmail/passwd.%d
  }

  socket listen {
    master {
      path = /var/run/dovecot/auth-master
      mode = 0666
    }
    client {
      path = /var/run/dovecot/auth-client
      mode = 0666
    }
  }
}